Profiling of workpieces

ABSTRACT

Workpieces of materials highly resistant to deformation or compaction but capable of plastic deformation under high pressure are subjected to transient, very high pressure applied to elements of the workpiece progressively, until the whole workpiece has been traversed. The pressure may be applied by a patterned formation which imposes its profile on the workpiece, or the workpiece may be kneaded into intimate contact with the pattern to receive its impress.

United States Patent 1191 Marcovitch May 21, 1974 [5 PROFILING OF WORKPIECES References Cited [75] Inventor: Jacob Marcovitch, Johannesburg, UNITED STATES PATENTS South Africa 1,560,999 1l/l925 Corizon 425/374 3.030.835 4 1962' K s 72/214 X Asslgneei 9 Profile Alma", Vaduz 342,387 5il886 szige r ifiorph 72/220 Llechtenstem 731,769 6/1903 Gillen et a1. 72/220 3,199,327 8/1965 KI'ZIUSC 72/210 X [211 App]. No.: 290,751 Primary Examiner-Milton S. Mehr Related us. Application Data Attorney, Agent, or Firm-Young & Thompson Continuation of S81. NO. 80,043; Oct. 12, 1970, abandoned, Continuation-impart of Ser. No. 615,613 Feb. 13 1967' P 3,533,259 workpieces of materials highly res1stant to deformation or compaction but capable of plastic deformation 30 Foreign Application priority Data under high pressure are subjected to transient, very Feb 1 4 1966 South Africa 66/804 h1gh pressure applied to elements of the workp1ece progressively, until the whole workpiece has been tra- [52] U S Cl 72,210 72/220. versed. The pressure may be applied by a patterned [51] /00 i U00 formation which imposes its profile on the workpiece, 158 Field OYs Qr iIIIII 1x13172010 226 215 115 'wmkpiece may be waded into intimate contact withthe pattern to receive its impress.

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1. A method of high pressure forming a metal workpiece by progressive plastic deformation from a metal blank having two opposite surfaces and utilising (i) die means with a die face having at least one recess therein, (ii) a roller, and (iii) means of backing up the roller; the method comprising (a) laying the blank on the die means so that it lies wholly to one side of the roller axis and with one of the said surfaces of the blank resting on the die means and overlying the recess, (b) with the blank stationary relative to the die, rolling the roller over the other surface of the blank while applying so great a force to the means of backing up the roller in a direction generally at right angles to the die face that the metal of the blank at the firstmentioned surface flows to enter the recess, and (c) progressively rolling said blank to substantially fill the recess at a tiMe when the roller is still spaced from the die, thereby to reduce the thickness of the portion of said blank that overlies the die face outside said recess and to cause said portion to conform to the die face.
 2. A method as claimed in claim 1 further comprising passing a plurality of rollers sequentially over the blank.
 3. A method as claimed in claim 1 comprising oscillating the roller so that it moves back and forth over the blank.
 4. A method as claimed in claim 1 comprising moving the roller in the same direction throughout the rolling operation. 